Various improvements and fixes

Source/Editor/Windows/Assets/PrefabWindow.Hierarchy.cs

@@ -114,10 +114,8 @@ namespace FlaxEditor.Windows.Assets
             public override DragDropEffect OnDragMove(ref Float2 location, DragData data)
             {
                 var result = base.OnDragMove(ref location, data);
-                if (result == DragDropEffect.None)
-                {
+                if (result == DragDropEffect.None && _dragHandlers != null)
                     result = _dragHandlers.Effect;
-                }
                 return result;
             }
 

Source/Engine/Content/Content.cpp

@@ -1070,7 +1070,8 @@ bool findAsset(const Guid& id, const String& directory, Array<String>& tmpCache,
     tmpCache.Clear();
     if (FileSystem::DirectoryGetFiles(tmpCache, directory, TEXT("*"), DirectorySearchOption::AllDirectories))
     {
-        LOG(Error, "Cannot query files in folder '{0}'.", directory);
+        if (FileSystem::DirectoryExists(directory))
+            LOG(Error, "Cannot query files in folder '{0}'.", directory);
         return false;
     }
 

Source/Engine/Engine/RandomUtil.cs

@@ -10,7 +10,10 @@ namespace FlaxEngine
     /// </summary>
     public static class RandomUtil
     {
-        private static readonly Random _random = new Random();
+        /// <summary>
+        /// Random numbers generator.
+        /// </summary>
+        public static readonly Random Random = new Random();
 
         /// <summary>
         /// Generates a pseudo-random number from normalized range [0;1].
@@ -19,7 +22,7 @@ namespace FlaxEngine
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static float Rand()
         {
-            return _random.Next(0, int.MaxValue) / (float)int.MaxValue;
+            return Random.Next(0, int.MaxValue) / (float)int.MaxValue;
         }
     }
 }

Source/Engine/Level/Actor.cpp

@@ -443,6 +443,19 @@ const String& Actor::GetLayerName() const
     return Level::Layers[_layer];
 }
 
+void Actor::SetLayerName(const StringView& value)
+{
+    for (int32 i = 0; i < 32; i++)
+    {
+        if (Level::Layers[i] == value)
+        {
+            SetLayer(i);
+            return;
+        }
+    }
+    LOG(Warning, "Unknown layer name '{0}'", value);
+}
+
 bool Actor::HasTag() const
 {
     return Tags.Count() != 0;

Source/Engine/Level/Actor.h

@@ -107,6 +107,11 @@ public:
     /// </summary>
     API_PROPERTY() const String& GetLayerName() const;
 
+    /// <summary>
+    /// Sets the name of the layer.
+    /// </summary>
+    API_PROPERTY() void SetLayerName(const StringView& value);
+
     /// <summary>
     /// Determines whether this actor has any tag assigned.
     /// </summary>